Abstract
ABSTRACT The Stewart, Burkhardt and Voo (SBV) equations, as modified by Sutton, give values of pseudocritical properties which, when used with the Dranchuk and Abou-Kassem (DAK) representation of the Standing and Katz (SK) chart, currently provide the most accurate estimates of compressibility factors for naturally occurring petroleum gases. However, other correlations must be used to account for the properties of the heptane plus fraction and the presence of acid gases. A modification of the SBV equations is presented which takes into account the effects of the heptane plus fraction, acid gases and nitrogen. The new correlation provides more accurate estimates of the compressibility factor than can be obtained by current methods and also eliminates the need for involving additional correlations for properties of the heptanes plus fraction and presence of acid gases and nitrogen. The modification was developed using a set of 896 data points, ranging in composition from lean, sweet to rich, acid gases, and was tested against representative gases from the literature.
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